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removing background
Hi all. I’m new the forum and am very excited that I stumbled upon this place. I had no idea how developed the community was. I have a simple question about After Effects. On this website their is a series of video portraits on the home page. I have this looping film of portraits as a .swf and .mov. I want to remove the backgrounds that are NOT black and replace them with black. I want all of those subjects in the video portraits to be on a black background. Any ideas? Thanks in advance.
~ Regards
Steven Case